$WOOCS->get_welcome_currency()

This function created to define what currency is "welcome" in WOOCS settings.

global $WOOCS;
$welcome_currency=$WOOCS->get_welcome_currency();
echo $welcome_currency;

Welcome currency is currency which will be set for the first visit of any unique visitor to your site if it's not redefined by GEO IP rules on the settings page of the plugin.

Shortcodes, functions, actions and filters reference for FOX WooCommerce Currency Switcher